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https://issues.apache.org/jira/browse/HDFS-10240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16580563#comment-16580563
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Wei-Chiu Chuang commented on HDFS-10240:
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Hi [~LiJinglun] thanks for your update. Sorry I didn't make myself clear.
The HDFS-13757.test.02.patch intends to make the test more robust, and less
likely to generate flaky failures. I attached [^HDFS-10240.005.patch] for
your reference. Would you please review and let me know if it's okay?
> Race between close/recoverLease leads to missing block
> ------------------------------------------------------
>
> Key: HDFS-10240
> URL: https://issues.apache.org/jira/browse/HDFS-10240
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: zhouyingchao
> Assignee: Jinglun
> Priority: Major
> Attachments: HDFS-10240 scenarios.jpg, HDFS-10240-001.patch,
> HDFS-10240-002.patch, HDFS-10240-003.patch, HDFS-10240-004.patch,
> HDFS-10240.005.patch, HDFS-10240.test.patch
>
>
> We got a missing block in our cluster, and logs related to the missing block
> are as follows:
> 2016-03-28,10:00:06,188 INFO org.apache.hadoop.hdfs.StateChange: BLOCK*
> allocateBlock: XXXXXXXXXX. BP-219149063-10.108.84.25-1446859315800
> blk_1226490256_153006345{blockUCState=UNDER_CONSTRUCTION,
> primaryNodeIndex=-1,
> replicas=[ReplicaUnderConstruction[[DISK]DS-bcd22774-cf4d-45e9-a6a6-c475181271c9:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-ec1413ae-5541-4b44-8922-c928be3bb306:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-3f5032bc-6006-4fcc-b0f7-b355a5b94f1b:NORMAL|RBW]]}
> 2016-03-28,10:00:06,205 INFO BlockStateChange: BLOCK*
> blk_1226490256_153006345{blockUCState=UNDER_RECOVERY, primaryNodeIndex=2,
> replicas=[ReplicaUnderConstruction[[DISK]DS-bcd22774-cf4d-45e9-a6a6-c475181271c9:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-ec1413ae-5541-4b44-8922-c928be3bb306:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-3f5032bc-6006-4fcc-b0f7-b355a5b94f1b:NORMAL|RBW]]}
> recovery started,
> primary=ReplicaUnderConstruction[[DISK]DS-3f5032bc-6006-4fcc-b0f7-b355a5b94f1b:NORMAL|RBW]
> 2016-03-28,10:00:06,205 WARN org.apache.hadoop.hdfs.StateChange: DIR*
> NameSystem.internalReleaseLease: File XXXXXXXXXX has not been closed. Lease
> recovery is in progress. RecoveryId = 153006357 for block
> blk_1226490256_153006345{blockUCState=UNDER_RECOVERY, primaryNodeIndex=2,
> replicas=[ReplicaUnderConstruction[[DISK]DS-bcd22774-cf4d-45e9-a6a6-c475181271c9:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-ec1413ae-5541-4b44-8922-c928be3bb306:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-3f5032bc-6006-4fcc-b0f7-b355a5b94f1b:NORMAL|RBW]]}
> 2016-03-28,10:00:06,248 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem: BLOCK*
> checkFileProgress: blk_1226490256_153006345{blockUCState=COMMITTED,
> primaryNodeIndex=2,
> replicas=[ReplicaUnderConstruction[[DISK]DS-bcd22774-cf4d-45e9-a6a6-c475181271c9:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-ec1413ae-5541-4b44-8922-c928be3bb306:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-85819f0d-bdbb-4a9b-b90c-eba078547c23:NORMAL|RBW]]}
> has not reached minimal replication 1
> 2016-03-28,10:00:06,358 INFO BlockStateChange: BLOCK* addStoredBlock:
> blockMap updated: 10.114.5.53:11402 is added to
> blk_1226490256_153006345{blockUCState=COMMITTED, primaryNodeIndex=2,
> replicas=[ReplicaUnderConstruction[[DISK]DS-bcd22774-cf4d-45e9-a6a6-c475181271c9:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-ec1413ae-5541-4b44-8922-c928be3bb306:NORMAL|RBW],
>
> ReplicaUnderConstruction[[DISK]DS-85819f0d-bdbb-4a9b-b90c-eba078547c23:NORMAL|RBW]]}
> size 139
> 2016-03-28,10:00:06,441 INFO BlockStateChange: BLOCK* addStoredBlock:
> blockMap updated: 10.114.5.44:11402 is added to blk_1226490256_153006345 size
> 139
> 2016-03-28,10:00:06,660 INFO BlockStateChange: BLOCK* addStoredBlock:
> blockMap updated: 10.114.6.14:11402 is added to blk_1226490256_153006345 size
> 139
> 2016-03-28,10:00:08,808 INFO
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem:
> commitBlockSynchronization(lastblock=BP-219149063-10.108.84.25-1446859315800:blk_1226490256_153006345,
> newgenerationstamp=153006357, newlength=139, newtargets=[10.114.6.14:11402,
> 10.114.5.53:11402, 10.114.5.44:11402], closeFile=true, deleteBlock=false)
> 2016-03-28,10:00:08,836 INFO BlockStateChange: BLOCK
> NameSystem.addToCorruptReplicasMap: blk_1226490256 added as corrupt on
> 10.114.6.14:11402 by /10.114.6.14 because block is COMPLETE and reported
> genstamp 153006357 does not match genstamp in block map 153006345
> 2016-03-28,10:00:08,836 INFO BlockStateChange: BLOCK
> NameSystem.addToCorruptReplicasMap: blk_1226490256 added as corrupt on
> 10.114.5.53:11402 by /10.114.5.53 because block is COMPLETE and reported
> genstamp 153006357 does not match genstamp in block map 153006345
> 2016-03-28,10:00:08,837 INFO BlockStateChange: BLOCK
> NameSystem.addToCorruptReplicasMap: blk_1226490256 added as corrupt on
> 10.114.5.44:11402 by /10.114.5.44 because block is COMPLETE and reported
> genstamp 153006357 does not match genstamp in block map 153006345
> From the log, I guess this is what has happened in order:
> 1 Process A open a file F for write.
> 2 Somebody else called recoverLease against F.
> 3 A closed F.
> The root cause of the missing block is that recoverLease increased gen count
> of blocks on datanode whereas the gen count on Namenode is reset by close in
> step 3. I think we should check if the last block is under recovery when
> trying to close a file. If so we should just throw an exception to client
> quickly.
> Although the issue is found on a 2.4 HDFS, it looks like the issue also exist
> on the trunk from code. I'll post a patch soon.
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